Gael blasendoeff



(No Model.)

.0. BLASENDORPF.

PUMP;

N0'.'252,350 Patented Jan."17, 1882..

WITNESSES: 7 V INVENTOR ATTOBF PATENT OFFICE.

CARL BLASENDORFF, OE BERLIN, GERMANY.

PUMP.

SPECIFICATION forming partof Letters Patent No. 252,350, dated January 17, 1882.

Application filed June 25,1881. (No model.)

To all whom 'it may concern:

Be it known that I, CARL BLASENDORFF, a resident of the city of Berlin, German Empire, have invented Improvements in Pumps,

jof which the following is a specification.

Figurel is a central longitudinal section of the auxiliary differential twin pump. Fig. 2

is a" similar section of the double-acting main pump, with which the auxiliary pump may be connected. Fig. 3 is a section of a single-acting main pump provided with automatic cutoff valves.

The twin cylinder B comprises end cylinders of uniform diameter and a larger intermediate central cylinder. Two smaller pistons, a a, move in the end cylinders, and a larger piston, b, in' the intermediate cylinder. These pistons are arranged in axial line on a single red. The end cylinders are provided with suction-pipes g g, which extend to the Water-source,and with suction-valves f f, and also with force-valves f f, which open communication by means of side channels with the central cylinder. Pipes d d, connecting thetwin cylinder with the main cylinder, open into the former on either side of the intermediate piston.

The main cylinder A'is shown as a double cylinder in Fig. 1 and as a single cylinder in Fig. 2. In the former case it is provided with two valve-openings communicating with the water conveying or discharge pipes, closed by is providedwith adjustable gages o o, by

two cut-0E valves, n n, which are connected to and operated by a single rod, m. m extends parallel with the pump-piston rod p, and passes through the eye of an adjustable arm,0, which projects from said piston-rod. It

This rod means of which the movement of the cut-oft valves is regulated.

One of the columns ofwater in the pipes 01 01 operates alternately as a piston for actuating the auxiliary pump. I

What is claimed as the invention is- 1. Thecombination of adouble acting main pump, an auxiliary differential twin pump having two suction and force valves and three pistons,and two pipes connecting the main and auxiliary pumps, substantially as described.

2. The combination of a double-acting main pump having double sliding cut-off valves, an auxiliary twin pump having two suction and force valves and three pistons, and two pipes connecting the mainaud auxiliary pumps, so arranged that the, water in each pipe is caused -to serve alternately as a regulating-weight to the pistons, substantially as described.

3. The combination of a double acting main pump having double sliding cut-off valves, a

reciprocatin g rod for operating the valves con- 

